“archean”*eon #2*
“ARCHEAN” (“eon #2”) (1.5 billion years) The Archean Eon (pronunciation: /ɑːrˈkiːən/, also spelled Archaean) is a geologic eon, 4,000 to 2,500 million years ago (4 to 2.5 billion years), that followed the Hadean Eon and preceded the Proterozoic Eon. (during […]